Principio Furnace, Cecil County, Maryland
circa 1860
circa 1860
1839-01
1963-07-04
1963-07-04
circa 1850
1854-1859, 1863-1866
circa 1911
1859
1880-09-12
1954-05-15
circa 1925
circa 1925
1835-1846
circa 1883-1888
circa 1920-1930
1742
1836
circa 1830
circa 1850-1860
1881
circa 1835-1840
circa 1930
1823
1846
2000
2000
circa 1852
1865-09-30
1914
1859
1864
1864
1861
1858
1964
circa 1864
1963-05-07
1913
1897
1888
1888-09
circa 1888
circa 1890
circa 1925
1882
circa 1860
circa 1920s
1853
circa 1815-1872
circa 1936
circa 1900
1798-11-08
circa 1904
1995-08-19
1994-07-04
1976-06-23
1871
1905-04-19
circa 1930
1975-07-15